Had acl surgery 3 weeks ago,as i was doing my rehab exercises, guess i hurt myself.i have shooting pain when knee fully extended, from glute to my foot. it's not been healed in a week. should i worry?

Call your doc: That kind of change is something your surgeon should hear about.

Yes & no : My recommendation is to stop your rehab exercises for the time being , ice the affected knee , avoid weight baring , start using your crutches again and contact your Orthopefic surgeon ASAP for further instructions . Hopefully no real damage has been done except staying in a Rehab longer . Good luck .